Lake Fryxell Sediment Core Data

Physical and chemical properties of sediment cores from Lake Fryxell, Antarctica, provide a means of reconstructing past paleoenvironmental, water-level, and water-source changes over the last 60,000 years. This dataset includes stable isotope (O, C), radiocarbon, U-series, sedimentological, and loss-on-ignition data. The oxygen data relate primarily to water-source changes in the lake basin. Carbon (both stable and radioactive) isotopes are influenced heavily by lake stratification and depth of the photic zone. The data record surface level changes of Lake Fryxell over the past 60,000 years. In addition, the dated sediments constrain the Ross Sea ice sheet to east of (seaward of) the lake through that entire time. Finally, stable oxygen isotopes document water source changes switching from local alpine glacier meltwater to Ross Sea ice sheet meltwater and then back to local glacier meltwater.

南极弗莱克塞尔湖（Lake Fryxell）沉积岩芯的物理与化学性质，为重建过去6万年以来的古环境、水位及水源演化提供了有效途径。本数据集涵盖稳定同位素（氧、碳）、放射性碳、铀系、沉积学及烧失量相关测试数据。其中，氧同位素数据主要反映该湖盆的水源变迁过程；碳同位素（包含稳定碳同位素与放射性碳同位素）的分布特征则主要受湖泊分层与透光带深度的影响。该数据集同时记录了过去6万年间弗莱克塞尔湖的湖面水位变化。此外，通过定年沉积物可限定：在整个6万年时段内，罗斯海冰盖（Ross Sea ice sheet）始终位于该湖以东（即向海一侧）。最后，稳定氧同位素序列完整记录了水源的转变历程：从当地高山冰川融水转为罗斯海冰盖融水，随后又转回当地冰川融水。